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Forces That Cause Motion. There are two main categories of information that are covered in this unit: (1) speed and (2) forces. In the end, we connect the two by exploring how the forces can affect the motion (speed) of an object.
Contractions happen when actin filaments actually slide over myosin filaments. This slide causes a change in the shape of the muscle cells producing movement, which is considered a muscle contraction. Depending on the muscle and the intended outcome of the contraction, muscles can either lengthen or shorten.